USTC Develops the First Quantum Memory that Records Orbital Angular Momentum of a Single Photon

<正>Scientists from the CAS Key Laboratory of Quantum Information based at the University of Science and Technology of China(USTC)in Hefei have achieved significant progresses in developing highdimensional quantum memory.Under the leadership of Prof.GUO Guangcan and Prof.SHI Baosen,they achieved the storage and release of a single photon with a spatial     

右可逆环的性质

引入右可逆环的定义,同时将可逆环的一些结论推广到右可逆环上．证明了右可逆环上的n×n上三角矩阵环Tn（R）是右可逆环;R是右可逆环,则R[x]／（x^n）是右可逆环,其中对任意正整数n,（x^n）是由x^n生成的理想．     

船用一体式可逆固体氧化物燃料电池的催化反应机理和传递过程的数值模拟分析

为研究可逆固体氧化物燃料电池（reversible solid oxide fuel cell, RSOFC）的催化反应机理和传递过程,基于多物理场传递和多步基元反应模型,采用合成气燃料,建立二维数学模型描述双向可逆工作过程,并通过实验进行验证。结果表明：电极吸附和解附反应分别集中于靠近气体通道和靠近电解质的区域;电极厚度和多孔微结构特征对气体扩散和表面成分分布影响显著。电化学反应集中在靠近电解质层的100 μm内。Nis和COs是发电和电解的主要表面成分。与宏观气体反应模型相比,表面基元反应模型的结果与实验值更接近。     

二类可逆直流调速系统功率器件对比分析

从能量传递方向角度,对比分析可逆直流桥式PWM调速系统和可逆直流V-M调速系统四象限运行时功率器件和电机的状态。首先独立分析两种系统的直流电源主电路形式和四象限运行状况;之后对比给出不同状态时两类系统功率器件的对应关系,给出直流PWM变换器的整流和逆变状态;最后利用正向轻载运行状态对结果进行验证,得到的结论有利于教学过程中学生对两类系统的深入理解。     

“双重联锁可逆控制”教学方案设计

本文通过＂双重联锁可逆控制＂这一课题的实习教案编写,在观念上体现了科学教和科学学这两个方面。在教学中突出学生的主体地位和以学为主的观念,以教师为主导体现素质教育和创新教育,提高学生的综合素质和学习上的创新能力,达到教学目标。     

粗粒土与结构接触面往返剪切试验的PFC2D数值模拟

为研究土颗粒的细观,利用PFC2D对粗粒土与结构接触面往返剪切试验进行数值模拟,研究接触面的剪胀特性与颗粒平移、旋转、破碎的关系及体应变可逆性和不可逆性规律.当不考虑颗粒破碎时,土体具有可逆性剪胀体应变;当考虑颗粒破碎时,土体具有不可逆性剪胀体应变.验证接触面体应变是由一个可逆性体应变分量与一个不可逆性体应变分量构成的.PFC2D位移场试验及类长形颗粒定向试验表明可逆性体应变主要由颗粒平移和颗粒自身旋转产生.对考虑颗粒破碎现象的黏结模型分析表明,不可逆性体应变主要由压密和破碎两种物态演化现象产生,颗粒破碎起主要作用.     

Keep It Simple: A Lesson in Linking Teens to Health Care

The Keep It Simple package, which includes a short animated film (available online for streaming or download), a lesson plan, and supporting materials, was designed to be used with adolescents ages 15–19 to empower them to seek sexual and reproductive health care, and emphasize the availability of long-acting reversible contraception (LARCs). The materials in the package can be used together to deliver a 45 minute educational session that provides information to teens about the sexual health services available to them at local health centers, their rights to obtain those services, and how they can link to high quality and adolescent friendly sexual health care. The animation can also be used as a standalone product. All components of the Keep It Simple package are available for free and are also offered in Spanish as No te compliques.     

钴(Ⅱ)-二乙基氯化胺配合物的固相合成与研究

室温条件下,六水合二氯化钴与二乙基氯化胺固相反应得到钴(Ⅱ)—二乙基氯化胺配合物,经IR,XRD,TG分析表征了该产物,研究了该配合物的可逆示温性.     

Bulk Polymerization of Styrene Using Benzyl Dithiobenzoate as a Chain Transfer

Bulk polymerization of styrene was carried out in the presence of a reversible addition-fragmentation chain transfer (RAFT) of benzyl dithiobenzoate (BDB). The comparison between reaction systems with and without BDB indicates that there is significant retardation in the reaction rate when BDB is used. The molecular weight of styrene polymer prepared with BDB shows linear relationship with the conversion of monomer, polydispersity is as narrow as 1.2, and no gel effects are observed during the polymerization with BDB, which are characteristics of a living radical polymerization. It has been found that the concentrations of BDB and azobis(isobutyronitrile) (AIBN) have opposite effects on the polymerization kinetics, and the AIBN dominates.     

"等效平衡"难点突破的探讨

“等效平衡”问题是化学平衡之教学难点，本文围绕如何突破这一难点进行了一些探讨，若将其应用于教学中，使学生不仅易于掌握，而且能够灵活运用．